Transition metal dichalcogenide dimer nano-antennas with ultra-small gaps
Abstract
Transition metal dichalcogenides have emerged as promising materials for nano-photonic resonators due to their large refractive index, low absorption within a large portion of the visible spectrum and compatibility with a wide range of substrates. Here we use these properties to fabricate WS double-pillar nano-antennas in a variety of geometries enabled by the anisotropy in the crystal structure. Using dark field spectroscopy, we reveal multiple Mie resonances, to which we couple WSe monolayer photoluminescence and achieve Purcell enhancement and an increased fluorescence by factors up to 240. We introduce post-fabrication atomic force microscope repositioning and rotation of dimer nano-antennas, achieving gaps as small as 105 nm, opening the possibility to a host of potential applications including strong Purcell enhancement of single photon emitters and optical trapping, which we study in simulations. Our findings highlight the advantages of using transition metal dichalcogenides for nano-photonics by exploring new applications enabled by their unique properties.
Keywords
Cite
@article{arxiv.2105.09201,
title = {Transition metal dichalcogenide dimer nano-antennas with ultra-small gaps},
author = {Panaiot G. Zotev and Yue Wang and Luca Sortino and Toby Severs Millard and Nic Mullin and Donato Conteduca and Mostafa Shagar and Armando Genco and Jamie K. Hobbs and Thomas F. Krauss and Alexander I. Tartakovskii},
journal= {arXiv preprint arXiv:2105.09201},
year = {2024}
}